Device Image Upgrade from FortiManager 1000D to Forticlient get stucked at 44%

Hey there. Some body knows how we can abort an Image Upgrade from Fortimanager 1000D to Forticlient? We tried to upgrade a firmware from FMG to forticlient and something went wrong, now we have a process of upgrade stucked at 44% more then 24h and it's impossible to abort it. We don't want to reboot a FMG. Maybe killing some process from CLI....

Thank's